$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ocplib-simplex.git /var/lib/mock/f42-build-865627-173376/root/chroot_tmpdir/scmroot/ocaml-ocplib-simplex
Cloning into '/var/lib/mock/f42-build-865627-173376/root/chroot_tmpdir/scmroot/ocaml-ocplib-simplex'...
$ git fetch origin a4f6dff1b9d431db8f4ec7b2d31f1aced56b169e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ocplib-simplex
 * [new ref]         a4f6dff1b9d431db8f4ec7b2d31f1aced56b169e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4f6dff OCaml 5.3.0 rebuild for Fedora 42